Detection tool

Abstract

The utility model relates to the technical field of battery pack box body structural strength detection, and provides a detection tool, in which a clamp is used for fixing a battery pack box body; the force application piece is arranged in the containing cavity and comprises a body and abutting parts, the abutting parts are connected to the two ends of the body, the sides, away from the body, of the abutting parts abut against the cavity wall of the containing cavity, the body generates expansionary force and acts on the cavity wall of the containing cavity, and the direction of the expansionary force is in the first direction; the detection unit comprises a distance sensor and a controller, the distance sensor is connected with the cavity wall of the containing cavity and measures the distance between the opposite cavity walls of the containing cavity in the first direction under the action of expansion force, and the controller is electrically connected with the distance sensor and outputs the distance measured by the distance sensor and the difference value of the distance value. Therefore, whether the structural strength of the battery pack box body meets the requirement or not can be accurately judged, a detection result is provided for design and manufacturing reference, and the yield of the battery pack box body is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery pack box structure strength detection, and in particular to a detection tool. Background Art

[0002] Cell to Pack (CTP) is a battery packaging technology that is widely used in the fields of energy storage and new energy vehicles. The cells in the CTP battery pack are directly integrated through the box to form a compact battery module to power external electrical devices.

[0003] Typically, the battery cells are tightly installed in a battery pack body according to a certain arrangement pattern and are sealed by the battery pack body.

[0004] However, during the charging and discharging process, the battery cells deform and generate expansion force, which acts on the battery pack case, causing the battery pack case to deform and easily leading to structural failure of the battery pack case. Utility Model Content

[0005] The present application provides a testing tool that can accurately determine whether the structural strength of a battery pack case meets the requirements, provide test results for design and manufacturing reference, and further improve the yield rate of the battery pack case.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] The present application provides a testing tool, which is applied to a battery pack box, wherein the battery pack box has a receiving cavity, and the testing tool comprises:

[0008] A clamp, used to fix the battery pack box;

[0009] A force-applying member, the force-applying member is disposed in the accommodating cavity, the force-applying member comprises a body and an abutting portion, the abutting portion is connected to two ends of the body along a first direction, a side of the abutting portion facing away from the body abuts against a cavity wall of the accommodating cavity, the body is configured to generate an expansion force and act on the cavity wall of the accommodating cavity, and the direction of the expansion force is along the first direction;

[0010] The detection unit includes a distance sensor and a controller, wherein the distance sensor is connected to the cavity wall of the accommodating cavity and is configured to measure the distance between the cavity walls of the accommodating cavity relative to each other along the first direction, and the controller is electrically connected to the distance sensor and is configured to output the difference between the distance measured by the distance sensor and a preset distance value, so as to determine the structural state of the battery pack case according to the difference.

[0011] The force-applying member in the inspection tooling provided in the present application can generate an expansion force equivalent to the expansion force of the battery cell, and act on the side wall of the battery pack case through the abutment portion set at the end of the force-applying member, and then detect the spacing of the side wall of the battery pack case along the direction of the expansion force through the detection unit, and compare the difference between the spacing and the preset spacing. When the difference is greater than 2mm, it can be determined that the structural strength of the battery pack case does not meet the requirements, that is, the structure of the battery pack case fails. In this way, not only can the structural strength of the battery pack case be tested, but also parameter basis can be provided for designers to timely adjust the design parameters and manufacturing process of the battery pack case, thereby improving the yield rate of the battery pack case.

[0012] As a possible implementation manner, the main body is a telescopic member, and the telescopic member is telescopically arranged along the first direction.

[0013] As a possible implementation manner, a side of the abutting portion facing away from the main body matches a cavity wall of the accommodating cavity.

[0014] As a possible implementation manner, the abutting portion is a plate, the plate and the body are connected along the first direction, and a plate surface of the plate facing away from the body matches a cavity wall of the accommodating cavity.

[0015] As a possible implementation, it further includes a profiling block, wherein the profiling block is arranged between the abutting portion and the cavity wall of the accommodating cavity along the first direction;

[0016] The side surface of the profiling block opposite to the abutting portion matches the abutting portion, and the side surface of the profiling block facing away from the abutting portion matches the cavity wall of the accommodating cavity.

[0017] As a possible implementation manner, the contoured blocks are symmetrically arranged between the abutting portion and the cavity wall of the accommodating cavity along the first direction.

[0018] As a possible implementation, the detection unit further includes an expansion force sensor, the expansion force sensor and the force applying member are provided correspondingly, the expansion force sensor is connected to the controller, and the expansion force sensor is configured to measure the expansion force.

[0019] As a possible implementation manner, the expansion force sensor is disposed between the abutting portion and a cavity wall of the accommodating cavity.

[0020] As a possible implementation manner, the telescopic member is a scissor jack.

[0021] As a possible implementation manner, there are a plurality of accommodating cavities, the plurality of accommodating cavities are arranged at intervals along the second direction, and the force applying members and the accommodating cavities are arranged correspondingly;

[0022] The second direction is perpendicular to the first direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a cross-sectional view of the CTP battery pack;

[0025] Figure 2 This is the mechanical analysis diagram of the CTP battery pack;

[0026] Figure 3 Installation structure of the detection tool provided in the embodiment of the present application Figure 1 ;

[0027] Figure 4 Installation structure of the detection tool provided in the embodiment of the present application Figure 2 .

[0028] Description of reference numerals:

[0029] 110-clamp;

[0030] 120-force applying member;

[0031] 121-Ontology;

[0032] 122-butt part;

[0033] 123-Scissor jack;

[0034] 130- profiling block;

[0035] 131-weight reduction hole;

[0036] 140- expansion force sensor;

[0037] 200-battery pack box;

[0038] 210-battery cell;

[0039] 220-accommodation cavity. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0041] Cell to Pack (CTP) is a battery packaging technology that is widely used in the fields of energy storage and new energy vehicles. The cells in the CTP battery pack are directly integrated through the box to form a compact battery module to power external electrical devices.

[0042] Figure 1 This is a cross-sectional view of the CTP battery pack. Figure 2 This is the mechanical analysis diagram of the CTP battery pack.

[0043] Common, such as Figure 1 and Figure 2 As shown, the battery cells 210 are tightly installed in the battery pack case 200 according to a certain arrangement rule and are sealed by the battery pack case 200. However, during the charging and discharging process of the battery cells 210, the battery cells 210 deform and generate expansion force F, which acts on adjacent battery cells 210 in sequence and is finally transmitted to the battery pack case 200, causing the battery pack case 200 to deform and easily causing structural failure of the battery pack case 200.

[0044] In order to overcome the defects in the prior art, the present application provides a detection tool including a force-applying member and a detection unit. The force-applying member can generate an expansion force equivalent to the expansion force F, and act on the side wall of the battery pack case 200 through the abutment portion set at the end of the force-applying member, and detect the spacing of the side walls of the battery pack case 200 along the direction of the expansion force through the detection unit, and compare the difference between the spacing and the preset spacing. When the difference is greater than 2mm, it can be determined that the structural strength of the battery pack case 200 does not meet the requirements, that is, the structure of the battery pack case 200 fails. In this way, not only can the structural strength of the battery pack case 200 be tested, but also parameter basis can be provided for designers to timely adjust the design parameters and manufacturing process of the battery pack case 200, thereby improving the yield rate of the battery pack case 200.

[0045] The content of the utility model will be described in detail below with reference to the accompanying drawings so that those skilled in the art can understand the content of the utility model more clearly and in detail.

[0046] Figure 3 Installation structure of the detection tool provided in the embodiment of the present application Figure 1 .

[0047] Figure 4 Installation structure of the detection tool provided in the embodiment of the present application Figure 2 .

[0048] like Figure 3 and Figure 4 As shown, an embodiment of the present application provides a detection tool that can be used for structural inspection of a battery pack case 200 .

[0049] The inspection tooling includes a fixture 110, a force-applying member 120 and an inspection unit. Among them, the fixture 110 is used to fix the battery pack case 200. Exemplarily, the fixture 110 can be placed on the mounting platform, and the fixture 110 has a clamping space that can accommodate the battery pack case 200. The battery pack case 200 is placed in the clamping space, and the distance between the fixture 110 and the battery pack case 200 is adjusted so that the fixture 110 and the battery pack case 200 are abutted. In this way, the battery pack case 200 is kept stable during the inspection process through the fastening and abutment between the fixture 110 and the battery pack case 200, so as to prevent the battery pack case 200 from detaching from the fixture 110 due to unbalanced force and causing injuries to the inspector.

[0050] Specifically, the battery pack case 200 has a receiving cavity 220. The battery cell 210 is placed in the receiving cavity 220, and the battery pack box seals the battery cell 210 to form a CTP battery pack. During the detection process, the force-applying member 120 is required to generate a certain expansion force and act on the battery pack case 200. Therefore, the force-applying member 120 in this embodiment is arranged in the receiving cavity 220. The force-applying member 120 includes a main body 121 and an abutting portion 122. The abutting portion 122 is connected to both ends of the main body 121 along the first direction (X direction). The side of the abutting portion 122 facing away from the main body 121 abuts against the cavity wall of the receiving cavity 220. The main body 121 is configured to generate an expansion force and act on the cavity wall of the receiving cavity 220. The direction of the expansion force is along the first direction (X direction).

[0051] In this way, the expansion force generated by the main body 121 along the first direction (X direction) toward the side of the abutment portion 122 acts on the cavity wall of the accommodating cavity 220 through the abutment portion 122, and the structural changes of the battery pack case 200 are further detected by the detection unit. In this way, it is possible to determine whether the structural strength of the battery pack case 200 meets the requirements and whether the structure of the battery pack case 200 has failed.

[0052] The detection unit in this embodiment includes a distance sensor (not shown in the figure) and a controller (not shown in the figure). The distance sensor is connected to the cavity wall of the accommodating cavity 220 and is configured to measure the distance between the cavity walls relative to the accommodating cavity 220 along the first direction (X direction). The controller is electrically connected to the distance sensor and is configured to output the difference between the distance measured by the distance sensor and the preset distance value to determine the structural state of the battery pack case 200 based on the difference.

[0053] It should be noted that the preset spacing value in this embodiment is the initial spacing between the cavity walls of two accommodating cavities 220 opposite to each other along the direction of the expansion force, that is, the spacing value when the cavity walls of the accommodating cavities 220 are not affected by the expansion force generated by the force applying member 120.

[0054] In this way, when the expansion force generated by the force-applying member 120 acts on the cavity wall of the accommodating cavity 220 along the first direction (X direction), the battery pack case 200 is deformed along the first direction (X direction). It can be understood that the distance between the two cavity walls of the accommodating cavity 220 opposite to each other along the first direction (X direction) also changes accordingly. The distance between the two cavity walls of the accommodating cavity 220 opposite to each other along the first direction (X direction) is measured by a distance sensor and subtracted from the preset distance value. When the difference between the distance measured by the distance sensor and the preset distance value is greater than 2 mm, it can be further determined that the strength of the battery pack case 200 does not meet the requirements, that is, in actual application, the battery pack case 200 is prone to deformation when the battery cell 210 is charged and discharged, which eventually causes damage to the CTP battery.

[0055] The body 121 of the force-applying member 120 can adjust the value of the expansion force generated by the body 121 through its own structural changes. In this way, the expansion force F generated by the battery cells 210 in the CTP battery with different structures can be further accurately simulated through the body 121 of the force-applying member 120, so that the detection tool can be suitable for detecting battery pack boxes 200 of different types or structures. In one embodiment, the body 121 is a telescopic member, and the telescopic member is telescopically arranged along the first direction (X direction).

[0056] The telescopic member can be a hydraulic cylinder, a pneumatic cylinder, an electronic telescopic rod, a screw threaded sleeve mechanism, etc. Through such a telescopic and adjustable mechanism, an expansion force can be generated on the side of the body 121 facing the abutment portion 122 and act on the cavity wall of the accommodating cavity 220 through the abutment portion 122. In order to make the abutment portion 122 of the body 121 along the first direction (X direction) abut against the cavity wall of the accommodating cavity 220, and the expansion force acts on the cavity wall of the accommodating cavity 220 through the abutment portion 122, therefore, no matter how the structure of the telescopic member in this embodiment is changed, the expansion forces generated at both ends of the telescopic member along the first direction (X direction) need to be ensured to be of the same size.

[0057] In a specific embodiment, the telescopic member is a scissor jack 123. The scissor jack 123 is placed in the accommodating cavity 220 along the first direction (X direction), and the two ends of the scissor jack 123 along the first direction (X direction) are respectively connected to the abutment portion 122. During the telescopic change of the scissor jack 123, both ends of the scissor jack 123 along the first direction (X direction) move along the first direction (X direction), and the movement amount of both ends of the scissor jack 123 in the first direction (X direction) is the same. In this way, the magnitude of the expansion force can be controlled by the scissor jack 123, and at the same time, it can be ensured that the expansion force acts on the relative cavity wall of the accommodating cavity 220 with the same magnitude along the first direction (X direction).

[0058] In some embodiments, the side of the abutment portion 122 facing away from the body 121 matches the cavity wall of the accommodating cavity 220. In this way, the expansion force generated by the body 121 acts evenly on the cavity wall of the accommodating cavity 220 through the abutment portion 122, so that the deformation of the accommodating cavity 220 is more uniform, avoiding excessive deformation of a certain position of the accommodating cavity 220, resulting in inaccurate detection results of the detection unit, and thus inaccurate judgment of the strength of the battery pack box 200 and the degree of failure.

[0059] Furthermore, in a specific embodiment, the abutting portion 122 is a plate, the plate and the body 121 are connected along a first direction (X direction), and a plate surface of the plate facing away from the body 121 matches a cavity wall of the accommodating cavity 220 .

[0060] The plate in this embodiment can be a metal part, such as an aluminum plate. Aluminum shell battery cells 210 are widely used because of their sturdy shell and various sizes. Aluminum plates are selected as the connection between the abutment portion 122 and the main body 121. On the one hand, the connection relationship between the battery cell 210 and the battery pack case 200 can be restored as much as possible through the plate, and the plate and the plate surface are adapted to the cavity wall of the accommodating cavity 220, so that when the expansion force generated by the main body 121 acts on the cavity wall of the accommodating cavity 220 through the abutment portion 122, the cavity wall of the accommodating cavity 220 changes more evenly, and the detection tooling can be more accurate in judging the strength and failure degree of the battery pack case 200 after being detected by the detection unit.

[0061] As mentioned above, the accommodating cavity 220 of the battery pack case 200 is used to accommodate the battery cell 210. The battery cell 210 will deform during the charging or discharging process, forming an expansion force F and acting on the cavity wall of the accommodating cavity 220. It can be understood that when the overall structure of the CTP battery is larger, the distance between the cavity walls of the accommodating cavity 220 of the battery pack case 200 relative to each other along the first direction (X direction) will also increase. At the same time, considering the cost issues in the actual operation process, it is necessary to select a smaller force-applying member 120 that is easy to carry and install, and the battery pack case 200 can still be detected through the interaction with the contour member.

[0062] Specifically, the detection tool also includes a profiling block 130, which is arranged between the abutment portion 122 and the cavity wall of the accommodating cavity 220; the side of the profiling block 130 relative to the abutment portion 122 matches the abutment portion 122, and the side of the profiling block 130 away from the abutment portion 122 matches the cavity wall of the accommodating cavity 220. It should be noted that the structure of the profiling block 130 in this embodiment is the same as the external structure, weight, and material of the actually installed battery cell 210. In this way, the actual installation environment in the accommodating cavity 220 can be simulated as much as possible by the force-applying member 120 and the profiling block 130, so that the detection result is more accurate.

[0063] In addition, common battery cells 210 are all metal parts, and the contoured blocks 130 in this embodiment are also the same metal parts, such as aluminum parts.

[0064] It should be noted that the shaped block 130 in this embodiment is only used to simulate the battery cell 210. In order to facilitate the production of the shaped block 130, a solid shaped block 130 can be used. However, the weight of the solid shaped block 130 after molding may be greater than the weight of the actual battery cell 210. Therefore, a weight reduction hole 131 can be provided on the shaped block 130 so that the weight of the shaped block 130 is substantially the same as the weight of the battery cell 210. Then, the shaped block 130 is placed between the abutting portion 122 of the force applying member 120 and the cavity wall of the accommodating cavity 220.

[0065] Furthermore, the profiling block 130 is symmetrically arranged between the abutting portion 122 and the cavity wall of the accommodating cavity 220 along the first direction (X direction). In this way, the two ends of the force-applying member 120 are transmitted to the profiling block 130 through the abutting portion 122 and act on the cavity wall of the accommodating cavity 220, so that the two ends of the force-applying member 120 act on the cavity wall of the accommodating cavity 220 more evenly, so that the detection result of the detection tool is more accurate.

[0066] like Figure 3As shown, three profiling blocks 130 are arranged between the abutting portion 122 of the first end of the force-applying member 120 facing the side of the accommodating cavity 220 and the cavity wall of the accommodating cavity 220. Correspondingly, three profiling blocks 130 are also arranged between the second end of the force-applying member 120 and the abutting portion 122 facing the side of the accommodating cavity 220 and the cavity wall of the accommodating cavity 220. In this way, the abutting portion 122 of the force-applying member 120 acts on the profiling blocks 130, and then the expansion force is applied to the cavity wall of the accommodating cavity 220 through the profiling blocks 130. On the one hand, the internal environment of the battery pack box 200 can be made closer to the actual use environment, and at the same time, the accuracy of the detection result of the detection tooling is improved.

[0067] Specifically, the detection unit in this embodiment further includes an expansion force sensor 140, which is disposed correspondingly to the force applying member 120, and is connected to the controller, and is configured to measure the expansion force. In this way, the expansion force sensor 140 can measure the magnitude of the expansion force generated by the force applying member 120, and further feed back to the controller, so that the structural change of the battery pack box 200 corresponding to a specific expansion force can be determined.

[0068] In the actual operation process, researchers found that the maximum single-side expansion force F that can be generated by the battery cell 210 along the first direction (X direction) is 20KN. Therefore, the detection range of the sensor in this embodiment needs to be able to detect 20KN.

[0069] Furthermore, the expansion force sensor 140 is disposed between the abutment portion 122 and the cavity wall of the accommodating cavity 220. In this way, the expansion force sensor 140 can detect the magnitude of the bilateral expansion force generated by both ends of the force-applying member 120 along the first direction (X direction), and adjust the unilateral expansion force generated by the force-applying member 120 at any time, so that the expansion forces on both sides are the same. Not only can the force-applying member 120 be kept balanced, but the force condition of the battery pack box can also be further accurately simulated, so that the detection unit can accurately detect the structural changes of the battery pack box 200 corresponding to the expansion force, so as to improve the accuracy of the judgment basis for the structural failure of the battery pack box 200.

[0070] In some embodiments, there are multiple accommodating cavities 220, and the multiple accommodating cavities 220 are arranged at intervals along the second direction (Y direction), and the force applying member 120 and the accommodating cavities 220 are arranged correspondingly; the second direction (Y direction) is perpendicular to the first direction (X direction).

[0071] like Figure 3 and Figure 4 As shown, the battery pack body 200 may have a plurality of accommodating cavities 220 , for example, 5 accommodating cavities, which is not limited in this embodiment.

[0072] The multiple accommodating cavities 220 in a complete battery pack case 200 are arranged at intervals along the second direction (Y direction), and the number of force-applying members 120 corresponds to the number of accommodating cavities 220, that is, each accommodating cavity 220 is provided with a force-applying member 120, and the force-applying members 120 in each accommodating cavity 220 are the same. In this way, the abutting portion 122 of the force-applying member 120 abuts against the cavity wall of the accommodating cavity 220, and then the expansion force generated by the force-applying member 120 acts on the cavity wall of the accommodating cavity 220. The structural changes of the battery pack case 200 are then detected by the detection unit to determine whether the structural strength of the battery pack case 200 meets the requirements.

[0073] Further, such as Figure 3 As shown, in this embodiment, when a profiling block 130 is provided in the accommodating cavity 220, the number of the profiling blocks 130 in each accommodating cavity 220 is the same, and the number of the profiling blocks 130 on both sides of the force-applying member 120 along the first direction (X direction) and between the cavity walls of the relative accommodating cavity 220 must also be ensured to be the same, so that the detection structure of the detection tooling is more accurate.

[0074] The detection tool provided in this embodiment is applied to a battery pack case, which has a receiving cavity. The detection tool includes a clamp, a force-applying member and a detection unit, wherein the clamp is used to fix the battery pack case; the force-applying member is arranged in the receiving cavity, the force-applying member includes a body and an abutting portion, the abutting portion is connected to both ends of the body along the first direction, the side of the abutting portion away from the body abuts against the cavity wall of the receiving cavity, the body is configured to generate an expansion force and act on the cavity wall of the receiving cavity, and the direction of the expansion force is along the first direction; the detection unit includes a distance sensor and a controller, the distance sensor is connected to the cavity wall of the receiving cavity, and is configured to measure the distance between the cavity walls of the receiving cavity relative to each other along the first direction under the action of the expansion force, the controller is electrically connected to the distance sensor, and is configured to output the distance measured by the distance sensor and the difference between the distance values. Through such a structural setting, it is possible to accurately determine whether the structural strength of the battery pack case meets the requirements, provide the detection results for reference in design and manufacturing, and further improve the yield rate of the battery pack case.

[0075] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0076] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0077] It should be easily understood that “on,” “above,” and “over” in this application should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above something” or “over,” but also may include the meaning of “above something” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0078] In addition, spatially relative terms, such as "below," "below," "below," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90° or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A detection tool, applied to a battery pack box, the battery pack box having a receiving cavity, characterized in that: The detection tooling comprises: A clamp, used to fix the battery pack box; A force-applying member, the force-applying member is disposed in the accommodating cavity, the force-applying member comprises a body and an abutting portion, the abutting portion is connected to two ends of the body along a first direction, a side of the abutting portion facing away from the body abuts against a cavity wall of the accommodating cavity, the body is configured to generate an expansion force and act on the cavity wall of the accommodating cavity, and the direction of the expansion force is along the first direction; The detection unit includes a distance sensor and a controller, wherein the distance sensor is connected to the cavity wall of the accommodating cavity and is configured to measure the distance between the cavity walls of the accommodating cavity relative to each other along the first direction, and the controller is electrically connected to the distance sensor and is configured to output the difference between the distance measured by the distance sensor and a preset distance value, so as to determine the structural state of the battery pack case according to the difference.

2. The detection tooling according to claim 1, characterized in that: The main body is a telescopic member, and the telescopic member is telescopically arranged along the first direction.

3. The detection tooling according to claim 1, characterized in that: A side of the abutting portion facing away from the main body matches with a cavity wall of the accommodating cavity.

4. The detection tooling according to claim 3, characterized in that: The abutting portion is a plate member, the plate member and the body are connected along the first direction, and a plate surface of the plate member facing away from the body matches a cavity wall of the accommodating cavity.

5. The detection tooling according to any one of claims 1 to 4, characterized in that: It also includes a profiling block, which is arranged between the abutting portion and the cavity wall of the accommodating cavity; The side surface of the profiling block opposite to the abutting portion matches the abutting portion, and the side surface of the profiling block facing away from the abutting portion matches the cavity wall of the accommodating cavity.

6. The detection tooling according to claim 5, characterized in that: The profiling block is symmetrically arranged between the abutting portion and the cavity wall of the accommodating cavity along the first direction.

7. The detection tooling according to any one of claims 1 to 4, characterized in that: The detection unit further includes an expansion force sensor, the expansion force sensor and the force applying member are correspondingly arranged, the expansion force sensor is connected to the controller, and the expansion force sensor is configured to measure the expansion force.

8. The detection tooling according to claim 7, characterized in that: The expansion force sensor is arranged between the abutting portion and the cavity wall of the accommodating cavity.

9. The detection tooling according to claim 2, characterized in that: The telescopic member is a scissor jack.

10. The detection tooling according to any one of claims 1 to 4, characterized in that: There are a plurality of accommodating cavities, and the plurality of accommodating cavities are arranged at intervals along the second direction, and the force applying members and the accommodating cavities are arranged correspondingly; The second direction is perpendicular to the first direction.

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